Grassy -- Martinez's family is surrounding themselves with all they have left of -- And although memories bring tears her parents and siblings are focusing on how she lived and what she loved. Her older sister Patricia says -- the -- always helped her family at home and worked hard to succeed at school student. Dig big good days and -- -- spewing didn't children a team. -- -- -- -- -- -- -- Oscar Martinez -- his two sisters to school in his BMW early Wednesday morning just in time for his zero period class at 640. -- yellow was waiting in the backseat until her first class at 740. But at the end of the school day Hirsch shocked siblings found her still in the car lifeless. With the fellow in the field. And then -- to school founders. -- my sister founded. -- A way. Preliminary tests done on the car gave investigators some insight. -- incident and turning them. I'm unlock it and conceiving it out. Not then turn -- not -- and about passenger side. And there's another clue officers discovered to make the situation even more heartbreaking. Our initial examination. Appears that the warrant was not Drupal. At the time without -- keeping him beautiful. Investigators say -- -- is very petite and -- reserved detectives say it's possible she was just waiting for assistance. So far there does not appear to be any sign of a struggle. -- there's no pipe breakage of the glass of the window or anything. That they that would indicate she try to -- escape by him by force but we're still looking at them.

This transcript has been automatically generated and may not be 100% accurate.

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